A body, ______ it is in motion, would never stop itself if there were no frictio

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问题 A body, ______ it is in motion, would never stop itself if there were no friction.

选项 A、where
B、by time
C、once
D、at the moment

答案 C

解析此题考查条件状语。应用排除法解此题。A项用来引导状语从句和定语从句，B项和D项为时间状语，因此应排除。C项为连词，意为“一旦……”，可用来引导条件状语从句。

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